How to Efficiently Parse a Comma-Separated String of Integers into an Array?

Parsing a Comma-Separated String of Integers

The task in this question involves parsing a string containing comma-separated integers into an integer array. To accomplish this, a straightforward approach is recommended:

Input Processing:

1. Create a string stream from the input string.
2. Iterate over the string stream character by character.
3. Read each number until encountering a comma (',').

Comma Handling:

1. After extracting a number, check the next character in the string stream.
2. If it's a comma, discard it to advance to the next number.
3. If not, the iteration continues to extract the next number.

Populating the Array:

1. With each extracted number, append it to an integer vector (to allow for dynamic resizing as needed).

Example Implementation:

Below is a C code example that demonstrates this approach:

#include <vector>
#include <string>
#include <sstream>
#include <iostream>

int main()
{
    std::string str = "1,2,3,4,5,6";
    std::vector<int> vect;

    std::stringstream ss(str);

    for (int i; ss >> i;) {
        vect.push_back(i);    
        if (ss.peek() == ',')
            ss.ignore();
    }

    for (std::size_t i = 0; i < vect.size(); i++)
        std::cout << vect[i] << std::endl;
}

Benefits:

• This approach is simple to understand and implement.
• It's efficient for parsing large strings with numerous comma-separated numbers.
• It's customizable for additional handling of special characters or other scenarios as needed.

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